As mentioned in the introduction, the description of spontaneous fission relies
heavily on the concept of tunneling across multi-dimensional potential energy
surfaces. Specifically, all realistic estimates of spontaneous fission
half-lives published so far are based on the WKB formula to estimate the
transmission coefficient through the barrier [1]}. The half-life
is then given by the inverse of the transmission coefficient times the number
of assaults to the barrier per unit time \(\nu \)  and reads
\(\tau _{\rm SF} = \frac{1}{\nu }\exp \left(\frac{2}{\hbar }\int _{a}^{b} ds\sqrt{2B(s)(\mathcal {V}(s) - E_0)}\right) ,\) 
